Trump might have used US muscle to achieve a settlement that Russia finds acceptable. LOL. Who knows.Maybe sleepy Joe as it turns out, is about the right sort of temperament for the job right now?
Russia are complaining about that aspect. It appears to go back to an agreement between Russia and the US that NATO would not get involved in eastern europe. I don't know if the US can use a veto in that respect.
Phosphorus has been mentioned. Illegal mentioned. It was used in Iraq. Bound to crop up as chemical has been mentioned. Usual use relates to this
In addition to its offensive capabilities, white phosphorus is a highly efficient smoke-producing agent, reacting with air to produce an immediate blanket of phosphorus pentoxide vapor. Smoke-producing white phosphorus munitions are very common, particularly as smoke grenades for infantry, loaded in defensive grenade launchers on tanks and other armoured vehicles, and in the ammunition allotment for artillery and mortars. These create smoke screens to mask friendly forces' movement, position, infrared signatures, and shooting positions. They are often called smoke/marker rounds for their use in marking points of interest, such as a light mortar to designate a target for artillery spotters.
I believe it can be used for incendiaries but also that there are far better options for that use.